mirror of
https://github.com/morpheus65535/bazarr.git
synced 2024-11-12 02:22:56 +08:00
283 lines
9.4 KiB
Python
283 lines
9.4 KiB
Python
import base64
|
|
import hashlib
|
|
|
|
from gevent.pywsgi import WSGIHandler
|
|
from ._compat import PY3
|
|
from .websocket import WebSocket, Stream
|
|
from .logging import create_logger
|
|
|
|
|
|
class Client(object):
|
|
def __init__(self, address, ws):
|
|
self.address = address
|
|
self.ws = ws
|
|
|
|
|
|
class WebSocketHandler(WSGIHandler):
|
|
"""
|
|
Automatically upgrades the connection to a websocket.
|
|
|
|
To prevent the WebSocketHandler to call the underlying WSGI application,
|
|
but only setup the WebSocket negotiations, do:
|
|
|
|
mywebsockethandler.prevent_wsgi_call = True
|
|
|
|
before calling run_application(). This is useful if you want to do more
|
|
things before calling the app, and want to off-load the WebSocket
|
|
negotiations to this library. Socket.IO needs this for example, to send
|
|
the 'ack' before yielding the control to your WSGI app.
|
|
"""
|
|
|
|
SUPPORTED_VERSIONS = ('13', '8', '7')
|
|
GUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
|
|
|
|
def run_websocket(self):
|
|
"""
|
|
Called when a websocket has been created successfully.
|
|
"""
|
|
|
|
if getattr(self, 'prevent_wsgi_call', False):
|
|
return
|
|
|
|
# In case WebSocketServer is not used
|
|
if not hasattr(self.server, 'clients'):
|
|
self.server.clients = {}
|
|
|
|
# Since we're now a websocket connection, we don't care what the
|
|
# application actually responds with for the http response
|
|
|
|
try:
|
|
self.server.clients[self.client_address] = Client(
|
|
self.client_address, self.websocket)
|
|
list(self.application(self.environ, lambda s, h, e=None: []))
|
|
finally:
|
|
del self.server.clients[self.client_address]
|
|
if not self.websocket.closed:
|
|
self.websocket.close()
|
|
self.environ.update({
|
|
'wsgi.websocket': None
|
|
})
|
|
self.websocket = None
|
|
|
|
def run_application(self):
|
|
if (hasattr(self.server, 'pre_start_hook') and self.server.pre_start_hook):
|
|
self.logger.debug("Calling pre-start hook")
|
|
if self.server.pre_start_hook(self):
|
|
return super(WebSocketHandler, self).run_application()
|
|
|
|
self.logger.debug("Initializing WebSocket")
|
|
self.result = self.upgrade_websocket()
|
|
|
|
if hasattr(self, 'websocket'):
|
|
if self.status and not self.headers_sent:
|
|
self.write('')
|
|
|
|
self.run_websocket()
|
|
else:
|
|
if self.status:
|
|
# A status was set, likely an error so just send the response
|
|
if not self.result:
|
|
self.result = []
|
|
|
|
self.process_result()
|
|
return
|
|
|
|
# This handler did not handle the request, so defer it to the
|
|
# underlying application object
|
|
return super(WebSocketHandler, self).run_application()
|
|
|
|
def upgrade_websocket(self):
|
|
"""
|
|
Attempt to upgrade the current environ into a websocket enabled
|
|
connection. If successful, the environ dict with be updated with two
|
|
new entries, `wsgi.websocket` and `wsgi.websocket_version`.
|
|
|
|
:returns: Whether the upgrade was successful.
|
|
"""
|
|
|
|
# Some basic sanity checks first
|
|
|
|
self.logger.debug("Validating WebSocket request")
|
|
|
|
if self.environ.get('REQUEST_METHOD', '') != 'GET':
|
|
# This is not a websocket request, so we must not handle it
|
|
self.logger.debug('Can only upgrade connection if using GET method.')
|
|
return
|
|
|
|
upgrade = self.environ.get('HTTP_UPGRADE', '').lower()
|
|
|
|
if upgrade == 'websocket':
|
|
connection = self.environ.get('HTTP_CONNECTION', '').lower()
|
|
|
|
if 'upgrade' not in connection:
|
|
# This is not a websocket request, so we must not handle it
|
|
self.logger.warning("Client didn't ask for a connection "
|
|
"upgrade")
|
|
return
|
|
else:
|
|
# This is not a websocket request, so we must not handle it
|
|
return
|
|
|
|
if self.request_version != 'HTTP/1.1':
|
|
self.start_response('402 Bad Request', [])
|
|
self.logger.warning("Bad server protocol in headers")
|
|
|
|
return ['Bad protocol version']
|
|
|
|
if self.environ.get('HTTP_SEC_WEBSOCKET_VERSION'):
|
|
return self.upgrade_connection()
|
|
else:
|
|
self.logger.warning("No protocol defined")
|
|
self.start_response('426 Upgrade Required', [
|
|
('Sec-WebSocket-Version', ', '.join(self.SUPPORTED_VERSIONS))])
|
|
|
|
return ['No Websocket protocol version defined']
|
|
|
|
def upgrade_connection(self):
|
|
"""
|
|
Validate and 'upgrade' the HTTP request to a WebSocket request.
|
|
|
|
If an upgrade succeeded then then handler will have `start_response`
|
|
with a status of `101`, the environ will also be updated with
|
|
`wsgi.websocket` and `wsgi.websocket_version` keys.
|
|
|
|
:param environ: The WSGI environ dict.
|
|
:param start_response: The callable used to start the response.
|
|
:param stream: File like object that will be read from/written to by
|
|
the underlying WebSocket object, if created.
|
|
:return: The WSGI response iterator is something went awry.
|
|
"""
|
|
|
|
self.logger.debug("Attempting to upgrade connection")
|
|
|
|
version = self.environ.get("HTTP_SEC_WEBSOCKET_VERSION")
|
|
|
|
if version not in self.SUPPORTED_VERSIONS:
|
|
msg = "Unsupported WebSocket Version: {0}".format(version)
|
|
|
|
self.logger.warning(msg)
|
|
self.start_response('400 Bad Request', [
|
|
('Sec-WebSocket-Version', ', '.join(self.SUPPORTED_VERSIONS))
|
|
])
|
|
|
|
return [msg]
|
|
|
|
key = self.environ.get("HTTP_SEC_WEBSOCKET_KEY", '').strip()
|
|
|
|
if not key:
|
|
# 5.2.1 (3)
|
|
msg = "Sec-WebSocket-Key header is missing/empty"
|
|
|
|
self.logger.warning(msg)
|
|
self.start_response('400 Bad Request', [])
|
|
|
|
return [msg]
|
|
|
|
try:
|
|
key_len = len(base64.b64decode(key))
|
|
except TypeError:
|
|
msg = "Invalid key: {0}".format(key)
|
|
|
|
self.logger.warning(msg)
|
|
self.start_response('400 Bad Request', [])
|
|
|
|
return [msg]
|
|
|
|
if key_len != 16:
|
|
# 5.2.1 (3)
|
|
msg = "Invalid key: {0}".format(key)
|
|
|
|
self.logger.warning(msg)
|
|
self.start_response('400 Bad Request', [])
|
|
|
|
return [msg]
|
|
|
|
# Check for WebSocket Protocols
|
|
requested_protocols = self.environ.get(
|
|
'HTTP_SEC_WEBSOCKET_PROTOCOL', '')
|
|
protocol = None
|
|
|
|
if hasattr(self.application, 'app_protocol'):
|
|
allowed_protocol = self.application.app_protocol(
|
|
self.environ['PATH_INFO'])
|
|
|
|
if allowed_protocol and allowed_protocol in requested_protocols:
|
|
protocol = allowed_protocol
|
|
self.logger.debug("Protocol allowed: {0}".format(protocol))
|
|
|
|
self.websocket = WebSocket(self.environ, Stream(self), self)
|
|
self.environ.update({
|
|
'wsgi.websocket_version': version,
|
|
'wsgi.websocket': self.websocket
|
|
})
|
|
|
|
if PY3:
|
|
accept = base64.b64encode(
|
|
hashlib.sha1((key + self.GUID).encode("latin-1")).digest()
|
|
).decode("latin-1")
|
|
else:
|
|
accept = base64.b64encode(hashlib.sha1(key + self.GUID).digest())
|
|
|
|
headers = [
|
|
("Upgrade", "websocket"),
|
|
("Connection", "Upgrade"),
|
|
("Sec-WebSocket-Accept", accept)
|
|
]
|
|
|
|
if protocol:
|
|
headers.append(("Sec-WebSocket-Protocol", protocol))
|
|
|
|
self.logger.debug("WebSocket request accepted, switching protocols")
|
|
self.start_response("101 Switching Protocols", headers)
|
|
|
|
@property
|
|
def logger(self):
|
|
if not hasattr(self.server, 'logger'):
|
|
self.server.logger = create_logger(__name__)
|
|
|
|
return self.server.logger
|
|
|
|
def log_request(self):
|
|
if '101' not in str(self.status):
|
|
self.logger.info(self.format_request())
|
|
|
|
@property
|
|
def active_client(self):
|
|
return self.server.clients[self.client_address]
|
|
|
|
def start_response(self, status, headers, exc_info=None):
|
|
"""
|
|
Called when the handler is ready to send a response back to the remote
|
|
endpoint. A websocket connection may have not been created.
|
|
"""
|
|
writer = super(WebSocketHandler, self).start_response(
|
|
status, headers, exc_info=exc_info)
|
|
|
|
self._prepare_response()
|
|
|
|
return writer
|
|
|
|
def _prepare_response(self):
|
|
"""
|
|
Sets up the ``pywsgi.Handler`` to work with a websocket response.
|
|
|
|
This is used by other projects that need to support WebSocket
|
|
connections as part of a larger effort.
|
|
"""
|
|
assert not self.headers_sent
|
|
|
|
if not self.environ.get('wsgi.websocket'):
|
|
# a WebSocket connection is not established, do nothing
|
|
return
|
|
|
|
# So that `finalize_headers` doesn't write a Content-Length header
|
|
self.provided_content_length = False
|
|
|
|
# The websocket is now controlling the response
|
|
self.response_use_chunked = False
|
|
|
|
# Once the request is over, the connection must be closed
|
|
self.close_connection = True
|
|
|
|
# Prevents the Date header from being written
|
|
self.provided_date = True
|